Hello,
I create routes WP by WP for cycling with the navigation function in locus. Sometimes I have to go back on the same route. It will be helpful to build the back-route automatically in locus. Therefor guide-function or "zurück führen" (in German translation) is not helpful.
I have not found such function. I am not expert in programming in android, perhaps the wp-database can be backuped with reversed WPs.